Coupling device based on water-filled bag

Abstract

The utility model discloses a coupling device based on a water-filled bag, and belongs to the technical field of geophysical prospecting professional drilling sound wave test probes. According to the utility model, the integral double-layer water-filled bag is used for completely wrapping the sonic probe, so that the small size of the existing air bag is eliminated, and a transmitter or a receiver can be in close contact with a hole wall through water in the bag; due to the fact that the emitter or the receiver of the sound wave probe can be completely wrapped by the double-layer water-filled bag, the requirement for operation is lowered, and the detection efficiency of the sound wave probe is improved; the inner bag is thickened towards the inner side at the contact part of the inner bag and the receiver or the transmitter of the acoustic probe, so that the problem that the inner side of the inner bag cannot be in close contact with the receiver or the transmitter is avoided, meanwhile, the thickened thickness is millimeter-level, the acoustic detection effect cannot be influenced, and the production is easy due to the thickening treatment in production; a coupling effect is provided; the problem of low detection efficiency in the prior art is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of borehole acoustic test probes in geophysical exploration, and specifically relates to a coupling device based on a water-filled bladder. Background Technology

[0002] Currently, drilling is the primary method used in engineering geological exploration. When conducting acoustic testing within boreholes, a single-transmitter / dual-receiver (or multi-receiver) acoustic probe or a dual-hole, single-transmitter / single-receiver acoustic probe is required. The probe must be coupled to the borehole wall via water. However, current field conditions are becoming increasingly complex. Boreholes are often fragmented, and testing depths are increasing. The boreholes can be vertically upward, vertically downward, horizontal, or obliquely upward or downward. These boreholes are difficult to retain water in, especially upward, oblique, and horizontal boreholes. Without water, coupling between the acoustic probe and the borehole wall is impossible, rendering this method of testing unusable.

[0003] To address the aforementioned issues, in the design of acoustic probes, to protect the receiver and transmitter, the diameter of the probe body is typically larger than the diameter at the receiver and transmitter, thus forming a groove-like structure. Currently, to achieve coupling between the receiver and transmitter of the acoustic probe and the wall hole, a method of wrapping an air-filled water-storage belt around the receiver and transmitter is commonly used. However, this method has many problems in practical operation.

[0004] Because the airbag area is small, even a slight tilt of the probe after filling it with water can reduce the contact area between the transmitter or receiver edge and the water, thus affecting the normal acquisition of waveforms. To obtain a complete waveform, operators often need to repeatedly fill and drain the probe to adjust its position, which not only increases the complexity of the operation but also significantly reduces the detection efficiency. Furthermore, attempting to wrap the airbag over a large area of ​​the probe body can result in poor coupling due to insufficient contact between the airbag and the borehole wall.

[0005] In summary, existing coupling devices suffer from problems such as small airbag area, high operational requirements, and low detection efficiency. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a coupling device based on a water-filled bladder, addressing the shortcomings of the prior art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A coupling device based on a water-filled bladder includes a double-layered water-filled bladder for wrapping an acoustic probe and a water injector.

[0009] The inner and outer bladders of the double-layered water-filled bag form a water storage cavity. The opening of the double-layered water-filled bag is provided with an exhaust port and a water inlet, which are connected to the water storage cavity.

[0010] The inner bladder is thickened inward at the point of contact with the receiver or transmitter of the acoustic probe.

[0011] The water injector is connected to the water inlet and is used to fill or pump water into the water storage chamber.

[0012] Furthermore, the outer bladder diameter > the inner bladder diameter > the acoustic probe diameter, and the length of the double-layered water-filled bladder > the length of the acoustic probe.

[0013] Furthermore, within a set length from the bag opening, the cross-sectional diameter of the double-layered water-filled bag gradually decreases along the axial direction, and the inner diameter of the bag opening is between 1 / 3 and 1 / 2 of the diameter of the acoustic probe, with a set length of 5cm to 12cm.

[0014] Furthermore, the bottom of the double-layered water-filled bag is a solid rubber semi-circular arc structure, with a uniform rubber thickness of 2cm to 5cm.

[0015] Furthermore, the thickened area adopts an inward protruding structure, which matches the curvature of the groove at the receiver or transmitter of the acoustic probe to achieve a tight fit.

[0016] Furthermore, the bag opening is equipped with multiple pairs of Velcro straps, which are interconnected to prevent the acoustic probe inside the double-layered water-filled bag from falling out.

[0017] This utility model has the following advantages compared with the prior art:

[0018] This invention achieves complete encapsulation of the acoustic probe through an integrated double-layered water-filled bag, eliminating the problems of small airbags in existing technologies. It ensures that the transmitter or receiver can achieve tight contact with the borehole wall through the water in the bag. Because the double-layered water-filled bag completely encapsulates the transmitter or receiver of the acoustic probe, it reduces operational requirements, saves time adjusting the probe's position, and improves detection efficiency. Furthermore, the inner bag is thickened at the contact point with the receiver or transmitter, preventing insufficient contact between the inner bag and the receiver or transmitter. This thickening is also millimeter-thick, not affecting the acoustic detection effect, and is easy to manufacture, providing better coupling. This effectively solves the problems of small airbag area, high operational requirements, and low detection efficiency in existing technologies.

[0019] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the double-layer water-filled bladder structure of an embodiment of the coupling device based on the water-filled bladder of this utility model.

[0021] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the coupling device based on a water-filled bladder according to this utility model;

[0022] Figure 3 This is a schematic diagram of the single-transmitter dual-receiver acoustic probe structure of an embodiment of the coupling device based on a water-filled bladder of this utility model.

[0023] Figure 4 This is a schematic diagram of the Velcro strap structure of an embodiment of the coupling device based on an inflatable bladder bag according to this utility model;

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Acoustic probe; 2. Receiver; 3. Transmitter; 4. Double-layered water-filled bladder;

[0026] 5. Vent; 6. Inlet; 7. Water storage chamber; 8. Inner bladder; 9. Outer bladder;

[0027] 10. Thickened section; 11. Bag opening; 12. Velcro strap; 13. Water inlet pipe; 14. Signal line; 15. Cable with length markings. Detailed Implementation

[0028] Example of a coupling device based on a water-filled bladder:

[0029] like Figures 1-3 As shown, the coupling device based on the water-filled bag includes a double-layered water-filled bag 4 for wrapping the acoustic probe 1 and a water injector. This embodiment uses a single-transmitter, dual-receiver acoustic probe 1 as an example to illustrate the device; the acoustic probe 1 can also be a single-transmitter, multi-receiver or single-transmitter, single-receiver acoustic probe 1. The single-transmitter, dual-receiver acoustic probe 1 has a total length of 67cm, with the receiver 2 and transmitter 3 occupying approximately 5cm of the length, a diameter of 38mm, and a detectable aperture of 45mm to 60mm. The single-transmitter, dual-receiver acoustic probe 1 is equipped with a signal line 14 and a cable 15 with length markings. The signal line 14 is used for communication with the receiver, and the cable 15 with length markings is used to detect the depth of the acoustic probe 1. Sound waves experience relatively low energy loss when propagating in liquids. By using a double-layered water-filled bag 4 to wrap the acoustic probe 1, a good propagation medium for the sound waves can be provided. Figure 1 The double-layered water-filled bag 4 is not fully filled with water.

[0030] The inner bag 8 and outer bag 9 of the aforementioned double-layered water-filled bag 4 form a water storage cavity 7. The bag opening 11 of the double-layered water-filled bag 4 is provided with an exhaust port 5 and a water inlet 6, which are connected to the water storage cavity 7. The aforementioned water injector is connected to the water inlet 6 and is used to fill or pump water into the water storage cavity 7. Water filling achieves tight contact between the acoustic probe 1 and the borehole wall. The water inlet 6 is designed with a threaded interface, and the corresponding water injection pipe 13 connected to the water injector also adopts a water injection pipe 13 with a nut-type connection end; when the bag is replaced, the original water injection pipe 13 can be disassembled and installed into the new bag for continued use.

[0031] The inner pouch 8 is thickened inwards at the contact point with the receiver 2 or transmitter 3 of the acoustic probe 1. The thickened portion 10 features an inwardly protruding structure, the curvature of which matches the groove at the receiver 2 or transmitter 3 of the acoustic probe 1, ensuring a tight fit. When the acoustic probe 1 is fitted into the double-layered water-filled pouch 4, these protruding structures embed into the groove of the acoustic probe 1, increasing the contact area and improving coupling. The minimum diameter of the groove at the dual-receiver acoustic probe 1 is 35mm; the corresponding thickest point of the thickened portion 10 is 1.5mm, gradually decreasing to 0mm towards both sides. The width of the thickened portion 10 is approximately 5cm. The thickening and the tight fit between the protruding structure and the probe's groove effectively reduce the gap between the pouch and the probe. The matching design of the protruding structure and the probe's groove makes it easier to align and install the pouch with the probe.

[0032] To facilitate the insertion of the acoustic probe 1 into the double-layered water-filled bag 4, the diameter of the outer bag 9 is greater than the diameter of the inner bag 8, which is greater than the diameter of the acoustic probe 1. The length of the double-layered water-filled bag 4 is greater than the length of the acoustic probe 1. The outer bag 9 has a diameter of 42 mm, and the inner bag 8 has a diameter of 40 mm.

[0033] Because this coupling device is generally used for upward-facing openings, to prevent the acoustic probe 1 from falling out of the double-layered water-filled bag 4, the cross-sectional diameter of the double-layered water-filled bag 4 gradually tapers along the axial direction within a set length from the bag opening 11. The inner diameter of the bag opening 11 is between 1 / 3 and 1 / 2 of the diameter of the acoustic probe 1, with a set length of 5cm to 12cm. The diameter of the bag opening 11 is 22mm; by setting the tapering structure and the inner diameter of the bag opening 11, it can accommodate acoustic probes 1 of different sizes.

[0034] To extend the service life of the double-layer water-filled bag 4, the bottom of the double-layer water-filled bag 4 is a solid rubber semi-circular arc structure with a uniform rubber thickness of 2cm to 5cm. This is because when the coupling device is inserted into the hole, the bottom of the double-layer water-filled bag 4 often contacts the obstacle or hole wall first, buffering the impact of the obstacle on the double-layer water-filled bag 4 and the acoustic probe 1, thus preventing damage from bumps and knocks.

[0035] like Figure 4As shown, the bag opening 11 is provided with multiple pairs of Velcro straps 12, which are interconnected to prevent the acoustic probe 1 inside the double-layered water-filled bag 4 from falling out. Preferably, the bag opening 11 is provided with two pairs of Velcro straps 12.

[0036] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A coupling device based on a water-filled bladder, characterized in that: It includes a double-layered water-filled bladder (4) for wrapping the acoustic probe (1) and a water injector; The inner bag (8) and outer bag (9) of the double-layer water-filled bag (4) form a water storage cavity (7). The bag opening (11) of the double-layer water-filled bag (4) is provided with an exhaust port (5) and a water inlet (6). The exhaust port (5) and the water inlet (6) are connected to the water storage cavity (7). The inner bladder (8) is thickened inward at the point of contact with the receiver (2) or transmitter (3) of the acoustic probe (1); The water injector is connected to the water inlet (6) and is used to fill or pump water into the water storage chamber (7).

2. The coupling device based on a water-filled bladder according to claim 1, characterized in that: The outer bladder (9) has a diameter greater than the inner bladder (8) and the acoustic probe (1) has a diameter greater than the inner bladder (8). The double-layered water-filled bladder (4) has a length greater than the acoustic probe (1).

3. The coupling device based on a water-filled bladder according to claim 1, characterized in that: The cross-sectional diameter of the double-layer water-filled bag (4) within a set length from the bag opening (11) is gradually reduced along the axial direction. The inner diameter of the bag opening (11) is between 1 / 3 and 1 / 2 of the diameter of the acoustic probe (1), and the set length is 5cm to 12cm.

4. A coupling device based on a water-filled bladder according to claim 1, characterized in that: The bottom of the double-layer water-filled bag (4) is a solid rubber semi-circular arc structure with a uniform rubber thickness of 2cm to 5cm.

5. A coupling device based on a water-filled bladder according to claim 1, characterized in that: The thickened part (10) adopts an inward protruding structure, and the protruding structure is consistent with the groove arc at the receiver (2) or transmitter (3) of the acoustic probe (1) to achieve a tight fit.

6. A coupling device based on a water-filled bladder according to claim 1, characterized in that: The bag opening (11) is provided with multiple pairs of Velcro straps (12), which are connected to each other to prevent the acoustic probe (1) inside the double-layered water-filled bag (4) from falling out.

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